Harriet Tubman

Universal History Archive, Getty Images

When abolitionist Harriet Tubman would not tie up an escaping slave, her slaveowner hit her in the head with a weight, which left a permanent indention in her forehead. She suffered from narcolepsy, seizures and chronic headaches because of that blow. (Source: National Women's History Museum)

When abolitionist Harriet Tubman would not tie up an escaping slave, her slaveowner hit her in the head with a weight, which left a permanent indention in her forehead. She suffered from narcolepsy, seizures and chronic headaches because of that blow. (Source: National Women's History Museum) (Universal History Archive, Getty Images)

When abolitionist Harriet Tubman would not tie up an escaping slave, her slaveowner hit her in the head with a weight, which left a permanent indention in her forehead. She suffered from narcolepsy, seizures and chronic headaches because of that blow. (Source: National Women's History Museum)